# Aligning equations with using fleqn

I use fleqn as a document class, but now I solve problem, how to align few equations to the center and few to the right.

I've tried \setlength{\mathindent}{1cm} but after that is the problem that I can't use previously used fleqn aligning.

Could you help me with any solution?

Thank you very much in advance!

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I don't think this is a good option since it makes your document inconsistent; that being said, you coud give a try to the nccmath package; declaring the fleqn package option you will have flushed left equations, and using the ceqn environment you can center some chosen equation(s):

\documentclass{article}
\usepackage[fleqn]{nccmath}

\begin{document}

\begin{align}
a &= b \\
&= c \\
&= d.
\end{align}

\begin{ceqn}
\begin{align}
a &= b \\
&= c \\
&= d.
\end{align}
\end{ceqn}

\end{document}

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It looks nice. But I have problem with my TeXworks. During the loading process TeXworks write me error message "! LaTeX Error: File nccmath.sty' not found." So I saved "nccmath.sty" to my style folder but there is still the same problem. –  astrak Dec 18 '12 at 20:32
Maybe will be better to write down my document setting.\documentclass[fleqn,a4paper,11pt]{article} (\manypackages) \usepackage{nccmath} \begin{document} –  astrak Dec 18 '12 at 20:40
@astrak I don't know which LaTeX distribution you are using, but here you find advise on installing packages for TeX Live tex.stackexchange.com/q/73016/3954 and for MikTeX tex.stackexchange.com/q/2063/3954 –  Gonzalo Medina Dec 18 '12 at 20:50
I found help in user guide of the nccmath package. Thank you very much for help! –  astrak Dec 18 '12 at 20:58
@astrak: FYI, I used to use the nccmath package package but ran into numerous issues that I decided to drop it. See Is there a replacement for nccmath?. If all you want is the felqn` environment, you can use Stefan Kottwitz's solution from nccmath affecting minipage widths. –  Peter Grill Dec 18 '12 at 21:16